Backlight module driving circuit
AssigneeHimax Technologies Limited
InventorsShu-Ming Chang, Yu-Pei Huang, Shen-Yao Liang, Shwang-Shi Bai
Life of this patent
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Abstract
A backlight driver circuit has a transformer, a switching circuit and a plurality of switch devices. The switching circuit couples a DC voltage to a primary side of the transformer and alternates polarities thereof so that an AC voltage is generated on a secondary side of the transformer to turn on the backlight blocks. The switch devices are respectively connected between one of the backlight blocks and the transformer, and the AC voltage turns the backlight blocks on when the switch devices are turned on.
Claims20
A backlight module driver circuit used to turn on a plurality of backlight blocks in a backlight module, the backlight driver circuit comprising:
- a transformer;
- a switching circuit coupling a DC voltage to a primary side of the transformer and alternating polarities thereof so that an AC voltage is generated on a secondary side of the transformer to turn on the backlight blocks;
- and
- a plurality of switch devices respectively connected between one of the backlight blocks and the transformer, and the AC voltage turns the backlight blocks on when the switch devices are turned on.
A backlight module driver circuit used to turn on a plurality of backlight blocks in a backlight module, the backlight driver circuit comprising:
- a plurality of transformers;
- a switching circuit coupling a DC voltage to primary sides of the transformers and alternating polarities thereof so that an AC voltage is generated on secondary sides of the transformers to turn on the backlight blocks;
- and
- a plurality of switch devices respectively connected to the transformers, and the switch devices are used to determine whether the backlight blocks are turned on,
- wherein when one of the switch devices is turned on, the transformer connected to the turned-on switch device outputs the AC voltage to turn on one of the backlight blocks.
A flat display panel, comprising:
- a pixel array comprising a plurality of display blocks;
- a backlight module comprising a plurality of backlight blocks, wherein the backlight blocks correspond the display blocks in position;
- and
- a backlight module driver circuit used to turn on the backlight blocks, the backlight module driver circuit comprising:
- a transformer;
- a switching circuit coupling a DC voltage to a primary side of the transformer and alternating polarities thereof so that an AC voltage is generated on a secondary side of the transformer to turn on the backlight blocks;
- and
- a plurality of switch devices respectively connected between one of the backlight blocks and the transformer, and the switch devices are used to determine whether the backlight blocks are turned on, wherein when one of the switch devices is turned on, the backlight block connected to the turned-on switch device is turned on by the AC voltage.
Dependencies are inferred from the claim text.